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- W3139103661 abstract "In this work we shall study the implications of a subclass of $E$-models cosmological attractors, namely of $a$-attractors, on hydrodynamically stable slowly rotating neutron stars. Specifically, we shall present the Jordan frame theory of the $a$-attractors, and by using a conformal transformation we shall derive the Einstein frame theory. We discuss the inflationary context of $a$-attractors in order to specify the allowed range of values for the free parameters of the model based on the latest cosmic-microwave-background-based Planck 2018 data. Accordingly, using the notation and physical units frequently used in theoretical astrophysics contexts, we shall derive the Tolman-Oppenheimer-Volkoff equations in the Einstein frame. Assuming a piecewise polytropic equation of state, the lowest density part of which shall be chosen to be the WFF1, or APR or the SLy EoS, we numerically solve the Tolman-Oppenheimer-Volkoff equations using a double shooting python-based LSODA numerical code. The resulting picture depends on the value of the parameter $a$ characterizing the $a$-attractors. As we show, for large values of $a$, which do not produce a viable inflationary era, the $M-R$ graphs are nearly identical to the general relativistic result, and these two are discriminated at large central densities values. Also, for large $a$-values, the WFF1 equation of state is excluded, due to the GW170817 constraints. In addition, the small $a$ cases produce larger masses and radii compared to the general relativistic case and are compatible with the GW170817 constraints on the radii of neutron stars. Our results indicate deep and not yet completely understood connections between non-minimal inflationary attractors and neutron stars phenomenology in scalar-tensor theory." @default.
- W3139103661 created "2021-03-29" @default.
- W3139103661 creator A5021272359 @default.
- W3139103661 creator A5070134354 @default.
- W3139103661 date "2021-03-13" @default.
- W3139103661 modified "2023-10-16" @default.
- W3139103661 title "Neutron Stars Phenomenology with Scalar-tensor Inflationary Attractors" @default.
- W3139103661 cites W1549581905 @default.
- W3139103661 cites W3044474922 @default.
- W3139103661 doi "https://doi.org/10.48550/arxiv.2103.07725" @default.
- W3139103661 hasPublicationYear "2021" @default.
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